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Contracts and Agreements (Additional Information) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Annual Fee for transfer agency services | $ 20,000 us-gaap_NoninterestExpenseTransferAgentAndCustodianFees
Maximum |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Annual Fee for transfer agency services | 75,000 us-gaap_NoninterestExpenseTransferAgentAndCustodianFees / us-gaap_RangeAxis = us-gaap_MaximumMember
Transaction fees per transaction | 15 usl_TransactionFeesPaidPerTransaction / us-gaap_RangeAxis = us-gaap_MaximumMember
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | 7 usl_CommissionsPaid / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Annual Fee for transfer agency services | 75,000 us-gaap_NoninterestExpenseTransferAgentAndCustodianFees / us-gaap_RangeAxis = us-gaap_MinimumMember
Transaction fees per transaction | 7 usl_TransactionFeesPaidPerTransaction / us-gaap_RangeAxis = us-gaap_MinimumMember
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | 15 usl_CommissionsPaid / us-gaap_RangeAxis = us-gaap_MinimumMember
First $500 million of USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.06%usl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupSixMember
Base amount for determining fee percentage | 500,000,000 usl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupSixMember
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.0465%usl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupSevenMember
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion | Maximum |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | 1,000,000,000 usl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupSevenMember / us-gaap_RangeAxis = us-gaap_MaximumMember
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion | Minimum |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | 500,000,000 usl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupSevenMember / us-gaap_RangeAxis = us-gaap_MinimumMember
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.035%usl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupEightMember
Base amount for determining fee percentage | 1,000,000,000 usl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupEightMember
Marketing Agreement | Maximum |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 10.00%usl_BaseFeePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TypeOfArrangementAxis = usl_MarketingAgreementMember
Marketing Agreement | USL's assets up to $3 billion |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.06%usl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupFourMember / us-gaap_TypeOfArrangementAxis = usl_MarketingAgreementMember
Marketing Agreement | USL's assets up to $3 billion | Maximum |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | 3,000,000,000 usl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupFourMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TypeOfArrangementAxis = usl_MarketingAgreementMember
Marketing Agreement | USL's assets in excess of $3 billion |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.04%usl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupFiveMember / us-gaap_TypeOfArrangementAxis = usl_MarketingAgreementMember
Marketing Agreement | USL's assets in excess of $3 billion | Minimum |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 3,000,000,000 usl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = usl_GroupFiveMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TypeOfArrangementAxis = usl_MarketingAgreementMember

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- Definition Fees paid to an agent employed by a corporation or mutual fund to maintain shareholder records, including purchases, sales, and account balances. Also includes custodian fees incurred during an accounting period from an agent, bank, trust company, or other organization that holds and safeguards an individual's, mutual fund's, or investment company's assets for them. These fees will be billed back to the client and are a component of noninterest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Base Fee Percentage + References No definition available. + Details
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- Definition Basis Amount for Fee Percentage + References No definition available. + Details
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- Definition Commissions Paid + References No definition available. + Details
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- Definition Transaction Fees Paid. + References No definition available. + Details
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